Dental inlay-holder.



` G. W. MILLAR.

DENTAL INLAY HOLDER.

APPLICATION HLBD Mmm, 191s,

1,124,498. Patented m12, 1915.

Inmemaf:

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CHARLES W. MILLAR, OF CARNEGIE, PENNSYLVANIA.

:DENTAL INLAY-HOLIDER.

tisanes.

Specification of Letters Patent.

Patented Jan. i2, i915.

Application filed March 11, 1913. Serial No. 753,543.

T 0 all s071071?, it may concern Be it known that l, CHARLES W. MILLAR, a citizen ofthe United States, and a resident of Carnegie, in the county of Allegheny and State of Pennsylvania, have invented a new and useful improvement in Dental Inlayl-lolders; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to dental inlay holders and has special reference to such a device for holding inlays 'for use in dental work and one in which the inlay can be quickly and conveniently clamped and as readily removed.

The object of my invention is to provide a cheap, simple and eflicient form of a dental inlay holder which will be simple in construction and light in weight and will consist of few parts which can be assembled with ease.

A further object of my invention is to provide a dental inlay holder which ca be made to grip and firmly hold the smallest particles or inlays so that the samemay be conveniently polished or have other operations placed upon the same without any handling which is very diflicult with small objects.

My invention consists, generally stated, in the novel arrangement, construction, and combination of' parts as hereinafter more specifically set forth and described and particularly pointed out in the claims.

To enable others skilled in the. artto which my invention app'ertains to construct and use my improved dental inlay holder, i will describe the same more fully referring to the accompanying drawing. in which Figure l is a side elevation of my improved dental inlay holder when not in use. Fig. 2 is a longitudinal sectional view of the same on the line 2&2 of Fig. 1. Fig. 3 is a side elevation of' the holder showing the same being used for holding an inlay for use in dental work. Fig. L1- is a similar view of the same with upper part of the barrel broken away. Fig. 5 is a modified form of the tension regulator.

Like symbols of reference herein indicate like parts in each of the figures oi the drawing.

As illustrated in the drawing my improved dental inlay holder A. has a round barrel 1 provided with a hollow interior 1 and said barrel is formed of any suitable material such as brass, steel, etc., and may be nickel plated or knurled to prevent the saine from slipping when held in the hand. rThe one end 2 of' the barrel l is flattened in order to torni an oblong opening 3 while thev short distance within the hollow interior 1 of the barrel l and has a shank portion 9 which has a gripping member 10 secured at each of the two sides of the same vby means of a pin 1l or by brazing or other suitable securing means, while the other end of said screw extends out through the hole 7 in the bushing 5 and is provided on the end of the same with a suitable tension regulating de! vice 12 as later described and explained.

The gripping members 10 which are attached to the shank portion 9 of the screw S arc :formed of spring steel or other spring material and have a straight portion i3 beyond which is a slightly inclined portion 14 which terminates in a curved jaw 15, said jaw having a sharp edge 16 for gripping the inlay or other object a.

The gripping members 10 are adapted to rest in the barrel l in such a position that the inclined portion lat of the same bear against 'the small sides of the oblong opening in said barrel as later explained.

The tension regulating device 12 consists of a nut portion 17 which has a threaded hole 18 therein for fitting onto the end of the screw 8 and such nut portion 17 is provided with a trunnion 19 on each side of the same for fitting into holes 19 on the U- shaped tension piece 20. The ends 2 1 of the tension piece 2O extend beyond the periphery of the nut portion 17 'for fitting against the flanged end 6 ot' the bushing 5, as later explained.

F ig. 5 shows a modified form of the tension regulatinfr device wherein the U-shaped tension piece 2O is dispensed with and the nut portion 17 operates in a pair of arms 22 which terminate at their outer ends in a thumb piece :2'2 which is knurled as shown to prevent the fingers slipping from the same.

The use and operation of my improved dental inlay holder A is as ollows:-The tension regulating device 12 is irst turned around so that the nut portion 1T will turn on the screw 8 in order to allow the curved jaws 15 to extend from the barrel 1, the proper distance required, and the inlay a or other object to be worked upon is then inserted between the open ends of the curved jaws 15 and such jaws pressed together by the lingers in order to allow the sharp edges 16 of the same to hold the inlay ain place. rl`he tension regulating device 12 which is in the position shown in Fis. 1 with the sides ot the U-shaped tension piece resting against the hanged end 6 of the bushing is now turned to the position Asuch as shown in F ig. 3 whereupon the ends 21 of said U-shaped tension piece will rest against the flanged end 6 ot' said bushing which will draw the screw 8 toward the same and the inclined portions 1lwill be drawn into the oblong opening 3 on the end of the barrel 1 which will bring the curved jaws 3 tight together and the sharp edges 16 oit' said jaws will bite into the inlay a and thus grip the saine tight to prevent its being removed. When the large piece ot gold has been removed from the inlay av and said inlay has been polished, the U-shaped tension piece will be pressed to its original position such as shown in F ig. 1, whereupon the jaws will be released and the inlay will fall from the holder.

It will be readily seen that my improved dental inlay holder may be used in other lines of work than dentistry and that the jaws can be regulated to give any size of opening between the same by the turning ofthe U-shaped tension regulator.

The device can also be made of any size in order to provide for work which has no small portion for gripping by the jaws.

Copies of this patent may be obtained for What I claim as my invention and desire to secure by Letters Patent is l. A holder having a barrel portion, gripping jaws extending from one end ot' said barrel and connecting with a screw in said barrel, said screw being adapted to extend through the other end otl said barrel and being provided with a tension regulator thereon, said tension regulator being nor- Inally at right angles to said screw and adapted to regulate the distance between said gripping means when rotated whilein this position and to draw said jaws together when moved to a position similar to said screw.

2. A holder having a barrel portion, gripping jaws extending from one end of sai barrel and connecting with a screw which extends from the other end of said barrel, and a tension regulator pivoted to the outer end of said screw, said tension regulator having aportion pivoted therein and rotatably adjustable on said screw and means for engaging with the end ot said barrel to draw said gripping aws together.

3. A. holder having a barrel portion, gripping jaws extending from one end of said barrel and connecting with a screw which' extends from the other end o'f said barrel, and a tension regulator pivoted to the outer end of said screw, said tension regulator having a portion pivoted therein and rotatably adjustable on said screw and portions extending beyond said pivotal portion for l engaging with the end ot' said barrel to draw said gripping jaws together.

ln testimony whereof, I, the said CHARLES YV. MiLLAR, have hereunto set my hand.

CHARLES WV. MXLLAR. wWitnesses J. N. COOKE, T. B. HUMPr-rrns.

five cents each, by addressiugthe Commissioner of Patents. Washington, D. C. I 

